Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5199a911570461…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 13:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2295c482cab45b49150a5b8d35d48de6 SHA-1: c5a4818ac89f55b415583c49a8900a53565b767f SHA-256: ad5199a911570461fa93e59d29d676b252c09bfd851372716b9aa2f701f9198d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hiroi-es.info/yamituki-n/uploads/files/30555544110.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/o6nkjcha5cf0ig48fnc9ao8p4h/wunizowajobonivomamojevo.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142781b1d9c4---xodabujowogunesatijo.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/88543149072.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/magaxawibojazorapanixevam.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/juxofupakojisaja.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1530c0218---pukono.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b85e3e38---lijevarafoxagimimokadat.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/tavuvebedataget.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/zufew.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rijuvuwujo.pdfIn PDF document text
    • http://qdjshg.com/files/file/gubixegozimamomewo.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/fanibemipa.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/86850628552.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/goxutukik.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/19911675794.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/foxefilatojatonarosoreteg.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/zijesutukejijaxi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/mutufosujowubepesexim.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/japikixanetamaxuzon.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/41375553363.pdfIn PDF document text
    • http://rurisnet.org/images/file/folurefijokaworusaji.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zedorilisibilexezib.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/rovupisegalemipod.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/79362538216.pdfIn PDF document text
    • http://esejsc.com/upload/files/56489588310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ninja+rush+game+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 18112 bytes
SHA-256: 501101a237f3d5467d581f1ea0e7d7204ce59c6689dc2742778ae0ce55a04af0
font_01_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 10892 bytes
SHA-256: 4aa0bb7eb412e5ea0af596e77a139a257b8bc59fd7d0c8652b869e8512a5c252
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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